Terrains don't always save/persist

[thommor]

Hi,

I've spent some of today playing around with this plugin in the hope it can fill the gap left by the built-in terrain system.

I've ran into a problem where the terrains aren't persisted when I restart Godot. I think I've identified the issue as being that I'm using a custom TileMap which is causing the terrains not to be saved.

There are no errors messages from what I can tell.